Hi,
  We try to create topo color from many polygon layer (steps =25 meters). In
some case mapnik has some bug result. As link follow:

http://navigasi.net/nntmp/layer9a.JPG
http://navigasi.net/nntmp/layer9b.JPG
http://navigasi.net/nntmp/layer9c.JPG

http://navigasi.net/nntmp/layer10a.JPG
http://navigasi.net/nntmp/layer10b.JPG
http://navigasi.net/nntmp/layer10cJPG

you can see result from our map layer 9 has different result from layer 10.
In my opinion, if my polygon data is wrong (ex: not closed area),  should be
no different result between layer 9 and 10 (both will have same error
result).

Is there any solution to fix this problem ?

regards

Buyung Akram
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